* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    list-style: none;
}

.focus {
    position: relative;
    width: 300px;
    height: 200px;
    border: 1px solid #333;
    overflow: hidden;
    margin: 0 auto;
}

.arrow1,
.arrow2 {
    position: absolute;
    display: block;
    width: 20px;
    height: 20px;
    display: none;
    z-index: 1;
}

.arrow1 {
    left: 0;
    top: 100px;
    float: left;
}

.arrow2 {
    right: 0;
    top: 100px;
    float: right;
}

ul {
    position: absolute;
    top: 0;
    left: 00px;
    width: 2000px;
}

ul li {
    float: left;
    width: 300px;
    height: 200px;
}

img {
    width: 100%;
    height: 100%;
}

.circle {
    position: absolute;
    bottom: 10px;
    left: 100px;
}

ol li {
    float: left;
    display: block;
    width: 10px;
    height: 10px;
    background-color: #fff;
    margin: 5px;
    cursor: pointer;
    border-radius: 5px;
}

.current {
    background-color: pink;
}